Synthesis of 1-Methyl-5-(pyrazol-3- and -5-yl- and 1, 2, 4-triazol-3- and 5-yl)-1, 2, 3, 6-tetrahydropyridine Derivatives and Their Evaluation as Muscarinic Receptor Ligands
A series of 1‐methyl‐5‐(pyrazol‐3‐ and ‐5‐yl‐ and 1, 2, 4‐triazol‐3‐ and 5‐yl)‐1, 2, 3, 6‐tetrahydropyridine derivatives structurally related to arecoline were synthesized and evaluated on M1, M2, and M3 muscarinicreceptors using [3H] pirenzepine and [3H] NMS as ligands. The binding affinity depended on the position and size of the substituents. The most interesting compounds were further evaluated
Heterocyclic compounds of the following formula:
wherein the dotted line designates an optional bond, and "het", R¹, R², R³, R⁴ and R⁵ are as defined in Claim 1,
as well as individual stereo isomers and pharmaceutically acceptable acid addition salts thereof are new and described as having potent acetylcholine (AcCh) agonist activity, indicating utility in the treatment of diseases caused by reduced function of AcCh in the brain.
Pharmaceutical compositions containing a compound of Formula I, and methods for the preparation of the said novel compounds are likewise described.